Quiz 2
(Due Oct 24)
Name_______________________________
Instructions: This is a take home quiz that is meant to encourage collaboration with your classmates. Tutors
cannot be consulted. You must show ALL work to receive credit.
1. From each formula/chemical symbol, write the name:
Mn3N7
______________________________________________________________
C3N3
______________________________________________________________
Mg3N2
______________________________________________________________
2. From each name, determine a chemical symbol.
Iron(II) Nitride
_____________________
Iron (III) Nitrate
_____________________
Iron (IV) Nitrite
_____________________
Nitrous Acid
_____________________
3. For each of the following, provide a formula or name, and Lewis dot structure for the following
combinations.
a. Silver and sulfur
________________________________________________________
b. Strontium and hydroxide ________________________________________________________
c. Arsenic and iodide
________________________________________________________
d. Potassium phosphate
________________________________________________________
Chem104-quiz2K
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4. Draw a Lewis Structure for each of the following polyatomic ions. Using formal charge as your guide,
determine which atom(s) carry a charge.
SO42-
CH3NH3+
Nitrate
5. Complete the table:
Element
Electron Orbital
Diagram
(shorthand
Okay)
Na
Si
3s
.
Na
Using the Energy
Diagram, explain
why the atom has
a common charge.
Losing one electron
from the 3s orbital
will result in a noble
gas configuration
Electron
Configuration
(shorthand
Okay
1s22s22p63s1
Chem104-quiz2K
Ba
[Ne] __
Lewis Symbol
Draw a Lewis
symbol for the ion
Mo
Na+
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6. ClO3- is a common polyatomic ion. There are 4 possible configurations of this ion, three with Cl as the
central atom one with O as the central atom. Elements which are in the third row, starting with P and
greater, can hold more than an octet of ions. Chlorine is in that group and may hold 5 pair of electrons
Using images in Figure 1, draw the three structures in boxes 1-3. Determine the formal charge on each
atom within the structure. Remember to put brackets around the structure, indicating an ion, and give it the
ions overall charge. In box 4, create a possible structure with O as the central atom. This problem will
work through proving that Chlorine must be the central atom.
Figure 1
a. How many valence electrons does this ion contain?
b. Draw the four possible structures, determine the formal charge on each atom within the structure.
Remember to put brackets around the structure, indicating an ion, and give it the ions charge.
1.
2.
3.
4.
c. Based on formal charge, which is the proper structure and why?
Chem104-quiz2K
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